Fuel Injector: Description and Operation

Fuel Injector:

PURPOSE
Spray highly atomized fuel into the manifold, near the intake valves.

LOCATION
In the intake manifold, near the head.

OPERATION
The injectors are "ON/OFF" solenoid valves installed one per cylinder on the intake manifold. The ECM sends pulses to energize (open) the injectors for varying lengths of time depending on its fuel requirement calculations, thereby controlling air/fuel ratio under a wide range of operating conditions.

The multi-point electronic fuel injection system consists of the ECM, various engine condition and operation sensors and the fuel system. Utilizing these inputs, the ECM calculates fuel injection quantity and timing. Because injector valve opening and fuel pressure are constants, the ECM controls injection quantity by varying the duration of injector "ON" time.